You can buy a flawless peptide and still get unreliable results — if it degrades on your bench. Peptides are sensitive molecules, and how they are stored, handled and shipped matters as much as how they were made. Here is what drives degradation and how to prevent it.
Why peptides degrade
- Oxidation: Met, Cys and Trp residues are especially vulnerable to air and light.
- Hydrolysis: moisture cleaves bonds, particularly at sensitive residues.
- Aggregation: hydrophobic peptides can clump out of solution.
- Deamidation: Asn and Gln slowly convert, shifting mass and activity.
Storage best practices
Most peptides are shipped lyophilized (freeze-dried) because dry powder is far more stable than solution. Keep lyophilized peptide sealed, desiccated and cold — typically −20 °C or colder for long-term storage, protected from light. In solution, stability drops sharply, so prepare working solutions fresh where possible.
Key point: dry, cold, dark and aliquoted is the formula — the biggest avoidable losses come from repeated freeze-thaw of solutions and from moisture reaching the powder.
Handling and reconstitution
Let vials warm to room temperature before opening to avoid condensation, choose an appropriate solvent for the peptide’s properties, and aliquot reconstituted material so each aliquot is thawed only once. Precise vialing at the point of manufacture — part of our custom peptide synthesis service — makes consistent handling far easier.
Shelf life and stability studies
For research material, follow the supplier’s storage guidance and certificate. For clinical and commercial material, shelf life is established formally through ICH-aligned stability studies under GMP, with degradation tracked over time by analytical methods. This evidence underpins the dating on a peptide API.